<template>
<div id="root">
  <h1>学生信息</h1>
  <button @click="student.age++">年龄+1岁</button><br>
  <button @click="addSex">添加性别属性，默认值：男</button><br>
  <button @click="addFriend">在列表首位添加一个朋友</button><br>
  <button @click="updateFirstFriendName">修改第一个朋友的名字：张三</button><br>
  <button @click="addHobby">添加一个爱好</button><br>
  <button @click="updateHobby">修改第一个爱好为：开车</button><br>
  <button @click="removeSmoke">过滤掉爱好中的抽烟</button><br>
  <h3>姓名：{{student.age}}</h3>
  <h3>年龄：{{student.age}}</h3>
  <h3 v-if="student.sex">性别：{{student.sex}}</h3>
  <h3>爱好：</h3>
  <ul>
    <li v-for="(h,index) in student.hobby" :key="index">
      {{h}}
    </li>
  </ul>
  <h3>朋友们：</h3>
  <ul>
    <li v-for="(f, index) in student.friends" :key="index">
      {{f.name}}--{{f.age}}
    </li>
  </ul>
</div>
</template>

<script>
export default {
  name: "ShuJuJianShi",
  data() {
    return {
      student:{
        name:'tom',
        age:18,
        hobby:['抽烟','喝酒','烫头'],
        friends:[
          {name:'jerry',age:35},
          {name:'tony',age:36}
        ]
      }
    }
  },
  methods: {
    addSex() {
      this.$set(this.student, 'sex', '男')
    },
    addFriend() {
      this.student.friends.unshift({name:'jack', age:70})
    },
    updateFirstFriendName() {
      this.student.friends[0].name= '张三'
    },
    addHobby() {
      this.student.hobby.push('学习')
    },
    updateHobby() {
      this.student.hobby.push('学习')
    },
    removeSmoke() {
      this.student.hobby = this.student.hobby.filter((h) =>{
        return h !== '抽烟'
      })
    }
  }
}
</script>

<style scoped>

</style>
